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UPDATE: Got a mail from Apple saying that the bug/issue has been fixed now and the next SDK release won't have this issue. Peace! I have this in the code for my AppDelegate: - (void) customizeAppearance { [[UISwitch appearance] setOnTintColor:[UIColor colorWithRed:0 green:175.0/255.0 blue:176.0/255.0 alpha:1.0]]; [[UISwitch appearance] setTintColor:[UIColor colorWithRed:255.0f/255.0f green:255.0f/255.0f blue:255.0f/255.0f alpha:1.000f]]; [[UISwitch appearance] setThumbTintColor:[UIColor colorWithRed:0.9 green:0.9 blue:0.9 alpha:1.0]]; } Which I then call from - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions I also use ARC. In iOS 6 my app keeps crashing. I enabled NSZombie and it keeps saying: *** -[UIDeviceRGBColor release]: message sent to deallocated instance 0x9658eb0 And now I've realized one perfectly reproducible flow for the above. When I comment out the setThumbTintColor line alone inside customizeAppearance, then everything works fine as it should. When I use the setThumbTintColor line instead, the app crashes the exact same way every time. Is this a known issue to anyone with UISwitch/setThumbTintColor/UIColor? What else could be the cause if not the switch color?

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